LTC1909-8EG#TR datasheet, PDF - EEWORLD Datasheet

Datasheet> All Categories > Power/power management> The power supply circuit> LTC1909-8EG#TR

LTC1909-8EG#TR: DescriptionIC reg ctrlr buck pwm CM 28-ssop; CategoryPower/power management The power supply circuit; File Size638KB，32 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

Download Datasheet Parametric Compare View All

LTC1909-8EG#TR Overview

IC reg ctrlr buck pwm CM 28-ssop

LTC1909-8EG#TR Parametric

Parameter Name	Attribute value
Brand Name	Linear Technology
Is it Rohs certified?	incompatible
Maker	Linear ( ADI )
Parts packaging code	SSOP
package instruction	SSOP,
Contacts	28
Manufacturer packaging code	G
Reach Compliance Code	_compli
ECCN code	EAR99
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER
control mode	CURRENT-MODE
Maximum input voltage	36 V
Minimum input voltage	4 V
Nominal input voltage	15 V
JESD-30 code	R-PDSO-G28
JESD-609 code	e0
length	10.2 mm
Humidity sensitivity level	1
Number of functions	1
Number of terminals	28
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Maximum output current	2 A
Package body material	PLASTIC/EPOXY
encapsulated code	SSOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	235
Certification status	Not Qualified
Maximum seat height	2 mm
surface mount	YES
Switch configuration	PUSH-PULL
Maximum switching frequency	200 kHz
Temperature level	INDUSTRIAL
Terminal surface	Tin/Lead (Sn/Pb)
Terminal form	GULL WING
Terminal pitch	0.65 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	20
width	5.3 mm

Preview

Download Datasheet

View All

LTC1909-8

Wide Operating Range,

No R

SENSE

Step-Down DC/DC

Controller with SMBus Programming

FEATURES

DESCRIPTIO

SMBus/I

Programmable Output Voltage:

1.3V to 3.5V

No Sense Resistor Required

2% to 90% Duty Cycle at 200kHz

ON(MIN)

≤

100ns

True Current Mode Control

Stable with Ceramic C

OUT

Power Good Output Voltage Monitor and 50µs Timer

Wide V

Range: 4V to 36V (Abs Max)

Precision Resistor Divider and Reference Provide

±1.35%

Output Voltage Accuracy Over Temperature

Adjustable Switching Frequency and Current Limit

Forced Continuous Control Pin

Programmable Soft-Start

Output Overvoltage Protection

Optional Short-Circuit Shutdown Timer

Available in a 28-Lead SSOP Package

The LTC

1909-8 is a synchronous step-down switching

regulator controller with a digitally programmable output

voltage. The output voltage is selected from one of two

5-bit settings programmed into internal registers via a

2-wire SMBus/I

C interface. The interface features safe-

guards against invalid output voltages and allows the mi-

croprocessor to turn the regulator on and off. Valley cur-

rent control delivers very low duty cycles without requiring

a sense resistor. Operating frequency is selected by an

external resistor and is compensated for variations in V

and V

OUT

Discontinuous mode operation provides high efficiency

operation at light loads. A forced continuous control pin

reduces noise and RF interference and can assist second-

ary winding regulation by disabling discontinuous mode

operation when the main output is lightly loaded.

Fault protection is provided by internal foldback current

limiting, an output overvoltage comparator and optional

short-circuit shutdown timer.

The LTC1909-8 is available in the 28-lead SSOP package.

, LTC and LT are registered trademarks of Linear Technology Corporation.

No R

SENSE

is a trademark of Linear Technology Corporation.

C is a trademark of Philips Electronics N.V.

APPLICATIO S

Power Supplies for DSPs, ASICs, FPGAs and CPUs

Voltage Margining

TYPICAL APPLICATIO

100k

11k

100k

0.1µF

LTC1909-8

39k

100pF

470pF

20k

SEL

SDA

SCL

VRON

RUN/SS

PGOOD

RNG

FCB

SGND

SEL

SDA

SCL

VRON

PGTMR

BOOST

SENSE

PGND

INTV

1Ω

0.1µF

1.4M 1%

0.22µF

1.8µH

CMDSH-3

20 5V

EXTV

EXT

GND

OSENSE

CPUON

4.7µF

6.3V

Figure 1. High Efficiency Step-Down Converter

19098f

10µF

50V

×4

5V TO 24V

GND

OUT

2.5V OR 2.6V

10A

OUT

SET BY SEL)

OUT1, 2

180µF

×2

OUT3

22µF

6.3V

X7R

GND

: UNITED CHEMICON THCR60E1H106TZ

OUT1, 2

: CORNELL DUBILIER ESRE181ME04B/

PANASONIC EEFVEOG181R

D1: DIODES INC. B340A

L1: SUMIDA CEP125-1R8MC-H

M1: Si4884

M2: Si4874

19098 F01

LTC1909-8EG#TR Related Products

	LTC1909-8EG#TR	LTC1909-8EG#PBF	LTC1909-8EG#TRPBF
Description	IC reg ctrlr buck pwm CM 28-ssop	IC REG CTRLR BUCK SMBUS 28SSOP	IC REG CTRLR BUCK SMBUS 28SSOP
Brand Name	Linear Technology	Linear Technology	Linear Technology
Is it Rohs certified?	incompatible	conform to	conform to
Maker	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )
Parts packaging code	SSOP	SSOP	SSOP
package instruction	SSOP,	SSOP, SSOP28,.3	SSOP,
Contacts	28	28	28
Manufacturer packaging code	G	G	G
Reach Compliance Code	_compli	compliant	compliant
ECCN code	EAR99	EAR99	EAR99
Analog Integrated Circuits - Other Types	SWITCHING CONTROLLER	SWITCHING CONTROLLER	SWITCHING CONTROLLER
control mode	CURRENT-MODE	CURRENT-MODE	CURRENT-MODE
Maximum input voltage	36 V	36 V	36 V
Minimum input voltage	4 V	4 V	4 V
Nominal input voltage	15 V	15 V	15 V
JESD-30 code	R-PDSO-G28	R-PDSO-G28	R-PDSO-G28
JESD-609 code	e0	e3	e3
length	10.2 mm	10.2 mm	10.2 mm
Humidity sensitivity level	1	1	1
Number of functions	1	1	1
Number of terminals	28	28	28
Maximum operating temperature	85 °C	85 °C	85 °C
Minimum operating temperature	-40 °C	-40 °C	-40 °C
Maximum output current	2 A	2 A	2 A
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	SSOP	SSOP	SSOP
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH	SMALL OUTLINE, SHRINK PITCH
Peak Reflow Temperature (Celsius)	235	260	260
Certification status	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	2 mm	2 mm	2 mm
surface mount	YES	YES	YES
Switch configuration	PUSH-PULL	PUSH-PULL	PUSH-PULL
Maximum switching frequency	200 kHz	200 kHz	200 kHz
Temperature level	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL
Terminal surface	Tin/Lead (Sn/Pb)	Matte Tin (Sn)	Matte Tin (Sn)
Terminal form	GULL WING	GULL WING	GULL WING
Terminal pitch	0.65 mm	0.65 mm	0.65 mm
Terminal location	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	20	30	30
width	5.3 mm	5.3 mm	5.3 mm

Recommended Resources

Phase-shift trigger circuit of single-junction transistorb

Resistor-capacitor oscillation circuit

Light control cycle flashing lights

Two-way mains automatic conversion power supply device

Power supply circuit diagram of SUNLIHT SM-546 color display

1Hz～1MHz multivibrator circuit

sst39vf1601 is down...: 唉，sst39vf1601芯片坏了------------------------------------------------------------ jflash-s3c44b0x v1.0 (2003-8-26) origin made by J.D&T Co.,Ltd ( You Young-chang ) origin made by ATMEL Co.,Ltd modified by...; 147802802 Embedded System

New distribution automation solution based on ADSP-CM40X processor: [size=4][font=微软雅黑][color=#000000][b]Distribution System[/b][/color][/font][/size][align=left][size=3][font=微软雅黑][color=#000000] [/color][/font][/size][font=微软雅黑][size=3][color=#000000]In modern smart...; eric_wang ADI Reference Circuit

EEDrone open source quadrotor from scratch——by lb8820265: [size=3][color=#008000][b]EEDrone open source quadrotor from scratch - by lb8820265[/b][/color][/size] [size=3][url=https://bbs.eeworld.com.cn/thread-509127-1-1.html]EEDrone open source quadrotor from...; okhxyyo DIY/Open Source Hardware

LPC1500 experience + (2) Manually modify LPC1549 registers in Keil MDK to control MCU operation: [i=s]This post was last edited by mars4zhu on 2014-9-20 10:43[/i] When debugging LPC15xx (or any supported chip) in Keil MDK, directly in Peripherals->System Viewer, click on a peripheral, you can set...; mars4zhu NXP MCU

【Group purchase】J-link V-7 (finished products or PCB parts), V8 finished products are in progress......: [b]Someone in the forum suggested: [/b]DIY a J-link: [url=https://bbs.eeworld.com.cn/thread-88948-1-1.html]https://bbs.eeworld.com.cn/thread-88948-1-1.html[/url] So, I contacted Tianyuan's Taobao stor...; soso Buy&Sell

TL16C754C extended serial port: I'd like to ask you guys, has anyone made an extended serial port driver for tl16c754c? My current driver is modified on 16c554 (the original driver works fine), and now this driver will send garbled ...; lshfrandy Embedded System

Shortcut: A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF AG AH AI AJ AK AL AM AN AO AP AQ AR AS AT AU AV AW AX AY AZ B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF BG BH BI BJ BK BL BM BN BO BP BQ BR BS BT BU BV BW BX BY BZ C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 CA CB CC CD CE CF CG CH CI CJ CK CL CM CN CO CP CQ CR CS CT CU CV CW CX CY CZ D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB DC DD DE DF DG DH DI DJ DK DL DM DN DO DP DQ DR DS DT DU DV DW DX DZ

Popular Components